loader.h

// loader.h: dynamic backend library loader// This file is part of scanbuttond.// Copyleft )c( 2005-2006 by Bernhard Stiftner//// This program is free software; you can redistribute it and/or// modify it under the terms of the GNU General Public License as// published by the Free Software Foundation; either version 2 of the// License, or (at your option) any later version.//// This program is distributed in the hope that it will be useful, but// WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU// General Public License for more details.//// You should have received a copy of the GNU General Public License// along with this program; if not, write to the Free Software// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.#ifndef __LOADER_H_INCLUDED#define __LOADER_H_INCLUDED#include "scanbuttond/scanbuttond.h"#ifndef MODULE_PATH_ENV# define MODULE_PATH_ENV "SCANBUTTOND_MODULE_PATH"#endifstruct backend;
typedefstruct backendbackend_t;
00031struct backend {
char* (*scanbtnd_get_backend_name)(void);
int (*scanbtnd_init)(void);
int (*scanbtnd_rescan)(void);
scanner_t* (*scanbtnd_get_supported_devices)(void);
int (*scanbtnd_open)(scanner_t* scanner);
int (*scanbtnd_close)(scanner_t* scanner);
int (*scanbtnd_get_button)(scanner_t* scanner);
char* (*scanbtnd_get_sane_device_descriptor)(scanner_t* scanner);
int (*scanbtnd_exit)(void);
void* handle; // handle for dlopen/dlsym/dlclosebackend_t* next;
};
int scanbtnd_loader_init(void);
void scanbtnd_loader_exit(void);
backend_t* scanbtnd_load_backend(constchar* filename);
void scanbtnd_unload_backend(backend_t* backend);
#endif